It takes the power of God in salvation to shake a sinner loose from the grips of sin. The gospel is “the power of God for salvation to everyone who believes” (Rom 1:16).
The Lord used a miracle to lead to an incarceration to lead to a prison break which led to a family being saved and a testimony going forward. All this resulted in God being glorified.
God providentially organizes and moves missionary teams to throw the net of the gospel far. Powerful witness is not the result of the initiative by men, but the operation of the risen Christ.
Paul did pinpoint preaching, keeping to the subject and hitting the target every time. He made adjustments depending on who his audience was, but the goal was always the gospel of God.